A pseudo-differential current-reuse structure for opamp-sharing pipelined analog-to-digital converters

作者：Moosazadeh Tohid; Yavari Mohammad^*

来源：International Journal of Circuit Theory and Applications, 2015, 43(7): 917-928.

DOI：10.1002/cta.1983

• current-reuse opamp-sharing structure
• pseudo-differential pipelined ADCs
• low-power low-voltage switched-capacitor circuits

In this paper, a power efficient pseudo-differential (PD) current-reuse structure is presented to alleviate the memory effects of opamp-sharing in pipelined analog-to-digital converters. To implement the PD current-reuse structure, a switched-capacitor circuit is introduced for multiplying digital-to-analog converter, which has a slight modification compared with the conventional switching scheme with no power penalty. In the proposed multiplying digital-to-analog converter circuit, the common-mode offset amplification of the PD structures is eliminated. Moreover, a PD current-reuse amplifier is developed from the telescopic structure with an inverter-based gain-boosting circuit. The effectiveness of the proposed structure is evaluated in comparison with existing current-reuse techniques.

• 出版日期2015-7